Electrolytic capacitor

Abstract

An electrolytic capacitor that includes a resin molded body including a stack that includes a capacitor element with an anode exposed at a first end surface, a dielectric layer on a surface of the anode, and a cathode opposite to the anode and exposed at a second end surface; a first external electrode on the first end surface and electrically connected to the anode; and a second external electrode on the second end surface and electrically connected to the cathode, wherein the first external electrode and the second external electrode each include: a resin electrode layer containing a conductive component and a resin component; and a Ni plating layer on a surface of the resin electrode layer, wherein a ratio of a thickness of the resin electrode layer to a thickness of the Ni plating layer is 5 or less.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application is a continuation of International application No. PCT / JP2020 / 003729, filed Jan. 31, 2020, which claims priority to Japanese Patent Application No. 2019-165391, filed Sep. 11, 2019, the entire contents of each of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to an electrolytic capacitor.BACKGROUND OF THE INVENTION[0003]Patent Literature 1 discloses a solid electrolytic capacitor including a capacitor element, a package made of an insulating resin covering the capacitor element, a first base electrode provided at a first end surface of the package from which a first positive electrode body is exposed, and coupled with the first positive electrode body, a first diffusion layer provided between the first positive electrode body and the first base electrode, a first external electrode provided on the first base electrode, and a second external electrode connected t...

AI Technical Summary

Benefits of technology

The present invention aims to provide an electrolytic capacitor that can prevent solder explosions. This is difficult to achieve because the organic components and water in the insulating resin and solid electrolyte layer cannot be eliminated completely. The invention introduces a new method to prevent solder explosions that ensures the safety and reliability of the electrolytic capacitor.

Problems solved by technology

However, when the solid electrolytic capacitor disclosed in Patent Literature 1 is subjected to a reflow treatment or the like in which the solid electrolytic capacitor is heat treated at a temperature of 150° C. to 260° C., organic components such as a plasticizer and water in the silver paste layer may expand explosively and cause scattering of molten solder, i.e., solder explosion.

However, since the insulating resin covering the capacitor element and a solid electrolyte layer inside the capacitor element also contain organic components and water, it has not been possible to completely prevent solder explosion merely by adjusting the amounts of the organic components and water in the silver paste layer.

Images